STP Advanced STP 2

Question 1

What is Per-VLAN Spanning Tree (PVST+)?

Accepted Answer

Cisco protocol running a separate STP instance for each VLAN, allowing per-VLAN load balancing

Answer

A single spanning tree for all VLANs

Answer

An STP replacement

Answer

A VLAN creation tool

Question 2

What is root guard in STP?

Accepted Answer

A feature preventing a port from becoming a root port, protecting the root bridge election

Answer

Physical security for the root bridge

Answer

A password for root access

Answer

A backup root bridge mechanism

Question 3

What is loop guard in STP?

Accepted Answer

A feature that prevents alternate or root ports from transitioning to designated/forwarding if BPDUs stop arriving

Answer

A physical loop prevention device

Answer

A cable management feature

Answer

An IP routing loop prevention

Question 4

How does STP handle unidirectional link failures?

Accepted Answer

Through features like UDLD (Unidirectional Link Detection) and loop guard

Answer

STP cannot detect unidirectional failures

Answer

By increasing the hello timer

Answer

Through manual intervention only

Question 5

What is the recommended practice for STP root bridge placement?

Accepted Answer

Place the root bridge on a high-performance core switch central to the network

Answer

Any switch can be root bridge without consequence

Answer

Place it on an edge switch

Answer

The root bridge does not matter

Question 6

What is the purpose of STP portfast?

Accepted Answer

To immediately transition access ports to forwarding state, skipping listening and learning

Answer

To make ports faster

Answer

To prioritize certain ports

Answer

To block unused ports